package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Override
    public void add(ShoppingCartDTO dto) {

        ShoppingCart shoppingCart = new ShoppingCart();

        BeanUtils.copyProperties(dto,shoppingCart);
        //每一个人只能查询属于自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //1,先判断当前的商品是否存在在购物车里?
        // 如果不存在,则新增,并且数量number默认为1 如果存在,则修改number = number + 1

        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList != null && shoppingCartList.size() > 0){
            //存在,更新数量number
            ShoppingCart cart = shoppingCartList.get(0);
            Integer number = cart.getNumber();
            cart.setNumber(number + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //不存在,新增
            //判断当前添加到购物车中的商品是菜品还是套餐
            if(dto.getDishId() != null){
                //菜品
                Dish dish = dishMapper.getDishById(dto.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //套餐
                Setmeal setmeal = setmealMapper.getById(dto.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCart.setNumber(1);
            shoppingCartMapper.save(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> list() {
        //获取微信登录人的用户id,查询购物车数据的时候每个人都只能查看自己的
        Long userId = BaseContext.getCurrentId();

        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        return list;
    }

    @Override
    public void clean() {
        shoppingCartMapper.clean(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
